also: しろあしげ
noun
flea-bitten gray (horse coat color)
A specific horse coat color pattern: white or gray base with small dark specks, resembling flea bites. Used in equestrian and breed contexts.
あの馬は白葦毛の美しい毛並みをしている。
That horse has a beautiful flea-bitten gray coat.
白葦毛は年をとるにつれて斑点がはっきりしてくる。
Flea-bitten gray becomes more speckled as the horse ages.
葦毛 (ashige) is a general term for gray or roan horse coats, while 白葦毛 specifically refers to the flea-bitten gray pattern with a white base and dark specks.
Compound of 白 (shira/shiro, 'white') and 葦毛 (ashige, 'gray/roan coat'). The reading しらあしげ is the more common form; しろあしげ is a variant. The term describes the flea-bitten gray pattern in horses.